Electric alarm.



PATENTED MAR. 26, 1907.

J. R. DONNENWORTH. ELEGTRIG ALARM.

APPLICATION FILED MAR. 2, 1906.

set forth in the specification and pointed.

fl'o all whom 6t- HZ/u concern/.

= Alberta and Dominion of Canada, have in- .inents in'electric alarms; and it consists in JACOB R. DONNENWORTH, OF

PATENT OFFICE.

LACOMBE, ALBERTA, oANADA.

ELECTRIC ALARM.

Be it known that I, JAcoB R. DONNEN- WORTH, a citizen of the Dom nion of-Canada, residing at Lacomhe, in the Province of vented certain new and useful Im rovenients in Electric Alarms, of which t 1e following is a full, clear, and exact description, reference being had to the accompanying drawings, formin a part hereof.

My invention as relation to improvethe novel construction offparts more fulLy out in the claim.

In the-drawings, Figure 1 is a side elevation of my device as applied to the various ofiices of a bank. I Fig. 2 is an enlarged side elevation of one end of the operatmgbar; Fig. 3 is atop plan of Fi 2, and Fig. 4 is a cross-section on line 4 4 Fig. 2.

' Theohject of nyinvention is to provide a mechanism adapted to be 0 eratedby the foot of a bank clerk, where y an electric. connection is made and an alarm sounded at any'point where an annunciator may be located.

In'detail the invention may be describedas follows: I

Referring to the drawings, 1 represents a horizontal-ly-shifting bar mounted in eye- Spec ifioation of Letters Patent.

Application filed March 2,1906. Serial No. 303.932.

Patented March 26, 1907.

spring 6, which normally forces the adjacent insulated head 7 of the bar away from the contact-plate 8. .The head; 7. bears against the. resilient spring circuit-closing plate 9 from which lead thewi'res w w, a similar series of conducting-wires. w leading from the plate 8, to a source of electric energy B and in the same circuitWit-h the wires w, an annunciator (not shown) being interposed in the circuit at any convenient point, such as the presiclents room or police headquarters. lniheovent of an attempted robiie'ry or assault upon the clerk the latter, though compelled to throw up his hands, can place his foot on the nearest roller 3' and push the bar l sufficiently to cause the latter to force theplate 9 against the plate 8, thus closing the circuit and sounding an alarm.

Having described my invention, What I claim is-- An electric alarm comprising a source of electric energy, a contact-plate, a circuitclosing spririgmlate, a longitudinally-movable bar, means for supporting the latter above the floor, rollers carried thereby, a spring for normally. forcing the bar away from the contact-plate, and an insulated head on the bar normally bearing against the circuit-closing plate, substantially asset forth.

In testimony whereof I a'llix my signature bolts 2, distributed along the floor, the bar being provided with aseries of" rollers'3, travi eling along the floor. One end of the her i is provided with a collar 4, between which and a bearing-block 5 is interposed a coiled j in presence of two witnesses. I

. JACOB It. DONNENWORTI'T. Witnesses ALBERT P. RAiNFoRTH,

JonN M KENTY. I 

